Terahertz Biomolecule Detection via Digital Modulation Analysis
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Solution Overview
Problem
Conventional terahertz systems integrating wireless communication and sensing functions face challenges such as increased complexity due to dual frequency band usage and inefficiencies like free space path loss and high power consumption.
Innovation Solution
A terahertz system that integrates wireless communication and sensing functions by analyzing the digital modulation characteristics of terahertz signals used in the communication band, allowing for biomolecule detection in targets by extracting features from eye diagrams, power spectrum density, and constellation diagrams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual frequency band system is used to separate communication and sensing functions, then communication performance is improved, but system complexity increases
Solution Approach 1:
The patent merges the communication and sensing functions into a single frequency band (terahertz band). The system uses the same terahertz signal for both wireless communication data transmission and biomolecule sensing. By analyzing digital modulation characteristics of the received terahertz signal, the system simultaneously achieves communication and sensing objectives, thereby reducing system complexity while maintaining communication performance.
Solution Approach 2:
The terahertz signal serves multiple functions simultaneously: it acts as both the carrier for wireless communication data and the probe for biomolecule sensing. The received signal is processed to extract both communication data and sensing information (such as eye diagrams, constellation diagrams, and power spectrum density) from the same signal, making the system universal and multi-functional.
2Measurement precision
If terahertz signals are used for sensing, then sensing sensitivity is improved, but free space path loss increases
Solution Approach 1:
The patent uses an optical signal as an intermediary to generate and modulate the terahertz signal. A laser source generates an optical signal that is then modulated by the information signal and used to drive the terahertz signal generation. This optical intermediary enables efficient terahertz signal generation with controlled power, mitigating the free space path loss issue while maintaining high sensing sensitivity through the terahertz band's unique interaction with biomolecules.
3Speed
If terahertz signals with high power are used to overcome path loss, then communication range is improved, but power consumption increases
Solution Approach 1:
The system uses periodic modulation of the terahertz signal through digital modulation techniques. The information signal modulates the terahertz carrier in a periodic manner, enabling efficient power utilization. This periodic action allows the system to achieve extended communication range through coherent detection and signal processing, rather than continuously increasing transmit power, thereby controlling power consumption.
Data Source
AI summary
A method of detecting a biomolecule, a computing device performing the method, and a biomolecule detection system therefor are provided. The method includes receiving a terahertz signal that passed deionized water or reference material, receiving a terahertz signal that passed a target including a predetermined biomolecule, extracting a digital modulation characteristic for the received terahertz signal that passed the deionized water and the received terahertz signal that passed the target, and detecting the predetermined biomolecule included in the target by analyzing the extracted digital modulation characteristic, wherein the received terahertz signal that passed the deionized water and the received terahertz signal that passed the target are generated using a digitally modulated optical signal based on a transmission speed determined based on kinematics of the predetermined biomolecule.